EP3033983A1 - Base station for a vacuum cleaner - Google Patents

Abstract

The invention firstly relates to a base station (1) for cleaning and / or emptying a suction dust chamber (5) of a first vacuum cleaner (3), which base station (1) has a base dust chamber (2), a first air inlet in fluid communication with the base dust chamber (2) (7) and a first air outlet (8) in fluid communication with the base dust chamber (2), the air inlet (7) and the air outlet (8) being fluidly connectable to an air duct (9) of the first vacuum cleaner (3) in that dust contained in the suction dust chamber (5) of the first vacuum cleaner (3) can be conveyed into the base dust chamber (2) by means of a blower (11) of the first vacuum cleaner (3). To provide a base station (1) to which a plurality of vacuum cleaners (3, 4) can be connected simultaneously, it is proposed that the base station (1) with the base dust chamber (2) fluidly connectable second air inlet (12) and one with the Base second chamber (2) fluidically connectable second air outlet (13), wherein the second air inlet (12) and the second air outlet (13) are fluidically connected to an air duct (10) of a second vacuum cleaner (4) that in a suction dust chamber (6 ) of the second vacuum cleaner (4) by means of the blower (11) of the first vacuum cleaner (3) in the base dust chamber (2) can be conveyed. Furthermore, the invention relates to a vacuum cleaner system with a base station (1) according to the invention, and to a method for cleaning and / or emptying a suction dust chamber (6).

Description

The invention relates to a base station for cleaning and / or emptying a suction dust chamber of a first vacuum cleaner, which base station has a base dust chamber, a first air inlet in fluid communication with the base dust chamber and a first air outlet in fluid communication with the base dust chamber, the air inlet and the air outlet fluidically can be connected to an air duct of the first vacuum cleaner, so that dust contained in the suction dust chamber of the first vacuum cleaner by means of a blower of the first vacuum cleaner is conveyed into the base dust chamber.

Base stations of the aforementioned type are well known in the art. These are used in particular in combination with vacuum cleaners which have a so-called permanent filter which is not replaced when completely filled with dust, but is freed of dust by means of a scavenging air flow in a direction opposite to the usual suction direction. For this purpose, the suction dust chamber of the vacuum cleaner is either connected to a blower of the base station or by means of a flow diversion to the fan of the vacuum cleaner own.

The publication EP 1 243 218 B1 For example, discloses a base station for cleaning and / or emptying a Saugstaubraumes, which base station comprises a base dust chamber, in which the dirt / dust from the Saugerstaubraum can be transferred, wherein a generated by the own blower of the vacuum cleaner to be cleaned suction air flow via the base dust chamber in the Saugerstaubraum deflected is, by means of the resulting negative pressure in the base dust chamber, the dirt from the Saugerstaubraum in the base dust chamber is sucked.

Although this type of base station has proven itself, this is only designed to clean a single vacuum cleaner. In addition, only the own blower of the vacuum cleaner is available for cleaning.

It is therefore an object of the invention to provide a base station to which a plurality of vacuum cleaners can be connected simultaneously. Advantageously, the vacuum cleaner should also participate in the cleaning of another vacuum cleaner.

To achieve the object, the invention proposes that the base station has a second air inlet fluidically connectable to the base dust chamber and a second air outlet fluidically connectable to the base dust chamber, wherein the second air inlet and the second air outlet are fluidically connectable to an air duct of a second vacuum cleaner, in that dust contained in a suction dust chamber of the second vacuum cleaner can be conveyed into the base dust chamber by means of the blower of the first vacuum cleaner.

As a result, a passive base station, ie a base station without its own fan, created, which can serve to clean and / or emptying a Saugstaubraumes several simultaneously connected to the base station vacuum cleaner. For this purpose, the base station provides air inlets and outlets for a plurality of vacuum cleaners, such as a first air inlet and first air outlet for a first vacuum cleaner, a second air inlet and second air outlet for a second vacuum cleaner, etc. The number of air inlets and outlets is generally not limited. The flow connections between the base dust chamber and the Saugerstaubräumen the vacuum cleaner are so switchable that is cleaned in terms of, for example, a first and a second vacuum cleaner connected either the Saugstaubraum the first vacuum cleaner by means of the fan of the first vacuum cleaner or that the Saugerstaubraum the second vacuum cleaner means the blower of the first vacuum cleaner is cleaned. Basically, it is also possible that the Suction dust chamber of the second or another vacuum cleaner is cleaned by means of its own blower.

For a cleaning of the suction dust chamber of the first vacuum cleaner by means of its own blower, a flow connection between the first vacuum cleaner and the base station is created in such a way that the blower of the first vacuum sucks air from the base dust chamber of the base station via the first air outlet. Air flows from the suction air space of the first vacuum cleaner into the base dust chamber via the first air inlet. In order to form a closed flow circuit, the suction dust space can in turn be connected to the blower of the first vacuum cleaner. Due to the flow connection thus formed, dust contained in the suction dust space of the first vacuum cleaner enters the base dust chamber and is filtered out there by means of a filter bag or the like arranged in the base dust chamber, so that the air flowing to the blower is freed from dust. The base dust chamber can be removed from the base station and emptied or cleaned, for example when the filter is completely covered with dust. Overall, it is thus no longer necessary that the vacuum cleaner itself has a removable filter. Rather, the air filter of the vacuum cleaner can be designed as a permanent filter.

It is proposed that the first air inlet and the second air inlet is associated with a valve which is adapted to selectively connect the base dust chamber with the suction dust chamber of the first vacuum cleaner or the suction dust chamber of the second vacuum cleaner. By means of the valve thus those flow connections can be made, which are necessary for cleaning / emptying of the suction dust chamber of the first and second vacuum cleaner. For this purpose, the valve is arranged at a central point, namely fluidically between the first air inlet and the second air inlet of the base station. Advantageously, the valve is designed as a flap valve, in principle, other designs of the valve are conceivable. The valve provides either a connection between the base dust chamber and the first air inlet or between the base dust chamber and the second air inlet ago. For example, if only a first vacuum cleaner is connected to the base station, the valve remains in a position in which the first air inlet is connected to the base dust chamber and the second air inlet is separated from the base dust chamber, so that the base dust chamber is connected exclusively to the suction dust chamber of the first vacuum cleaner is.

Likewise, it is recommended that the first air outlet and the second air outlet is associated with a valve which is adapted to connect the blower of the first vacuum cleaner either with the Saugstaubraum the first vacuum cleaner or the Saugstaubraum the second vacuum cleaner. By means of this configuration, the valve can be switched, for example, so that either the suction dust chamber of the first vacuum cleaner or that of the second vacuum cleaner is cleaned by means of the blower of the first vacuum cleaner. For a cleaning of the suction dust chamber of the second vacuum cleaner, for example, the valve disposed between the first air outlet and the second air outlet is switched so that the vacuum cleaner chamber of the second vacuum cleaner is in flow communication with the blower of the first vacuum cleaner. Through this connection, the blower of the first vacuum sucks dust from the suction dust chamber of the second vacuum cleaner in the base dust chamber of the base station. The valve may also be a flap valve or the like in this case.

Furthermore, it is proposed that the valve is set up to release a flow connection between the air duct of the second vacuum cleaner and the base dust chamber when connecting the air duct of the second vacuum cleaner to the second air inlet and the second air outlet. According to this embodiment, the user of the base station does not have to manually adjust the valves in the area of the air inlets and air outlets. Rather, the valves are automatically switched to the connection of a second vacuum cleaner to the base station so that a flow connection between the second vacuum cleaner and the base station and also to the first vacuum cleaner is given.

It is proposed that the valve is switchable, for example, by mechanical action of a portion of the second vacuum cleaner. The subregion of the second vacuum cleaner may be, for example, a Saugkanalendbereich which acts mechanically on the valve. The mechanical action can affect both the valve in the air inlet and the valve in the air outlet. It is conceivable, for example, an exclusively mechanical pressing or regurgitation of a valve flap or the like.

In addition, the valve may be connected to an electromechanical valve control which controls the valve in response to a connection status of the second vacuum cleaner to the second air inlet and / or the second air outlet. The valve control includes, for example, a sensor system which detects the arrangement of a second vacuum cleaner to the base station. In this case, a corresponding switching signal is transmitted to the valve or the valves. In this sense, the base station may, for example, have electrical contacts which detect a particular shape corresponding installation of a portion of the second vacuum cleaner to the base station, so that, for example, not only can be decided whether a second vacuum cleaner has been connected to the base station, but also whether the second vacuum cleaner corresponds to a certain suction type, which can be sucked by the base station.

The base station may also be configured to establish a closed flow circuit between the first vacuum cleaner and the base station and / or between the first vacuum cleaner and the second vacuum cleaner. The closed flow circuit is formed by the fact that the fan (suction side) of the first vacuum sucks air from the base dust chamber or the attached Saugerstaubraum the first or second vacuum cleaner, which Saugerstaubraum is in turn connected to the fan (pressure side) of the first vacuum cleaner.

In order to increase the usefulness of the base station for the user, it is additionally proposed that the base station has an electric charger which can be connected to an accumulator of the first vacuum cleaner and / or of the second vacuum cleaner. Thus, the vacuum cleaner arranged at the base station can not only be cleaned / emptied, but at the same time be charged with respect to their accumulators. The user does not need to dispense the vacuum cleaner or vacuum cleaners for several consecutive maintenance work, but rather various maintenance tasks, namely emptying and charging the battery, carried out at the same time.

In addition to the base station described above, the invention also proposes a vacuum cleaner system with a base station according to the invention, a first vacuum cleaner corresponding thereto and a second vacuum cleaner likewise corresponding thereto. The vacuum cleaners correspond to the base station in the sense that they have compatible air connections to each other. The vacuum cleaner system, for example, as a first vacuum cleaner have a hand vacuum cleaner and a vacuum cleaner as the second vacuum cleaner. The base station according to one of the previously explained embodiments is configured such that the air ducts of the vacuum cleaner are connectable to the base dust chamber of the base station, that a closed flow circuit between the first vacuum cleaner and the base station and between the first vacuum cleaner and the second vacuum cleaner is made. The vacuum cleaner system can thus clean different vacuum cleaners, for example, only a first vacuum cleaner may be connected to the base station, so that only its Saugerstaubraum is emptied by means of its fan, or both a first and a second vacuum cleaner may be connected to the base station, also The suction dust chamber of the second vacuum cleaner is cleaned by the blower of the first vacuum cleaner. Of course, the vacuum cleaner system in addition to the first and the second vacuum cleaner still have more vacuum cleaners. These are then defined in the context of the invention also as a second vacuum cleaner. Basically, of course, a suction dust chamber of a second vacuum cleaner by means of the own blower of the second Vacuum cleaner to be cleaned. It is in the sense then a first vacuum cleaner.

In addition to the base station and the vacuum cleaner system, a method for cleaning and / or emptying a vacuum cleaner room of a second vacuum cleaner by means of a vacuum cleaner system according to the invention is also proposed, wherein the first air inlet and the first air outlet of the base station are connected to the air duct of the first vacuum cleaner, and that second air inlet and the second air outlet of the base station to be connected to the air duct of the second vacuum cleaner, wherein subsequently in the suction dust chamber of the second vacuum cleaner dust is conveyed by means of the blower of the first vacuum cleaner in the base dust chamber. The inventive method thus makes it possible to clean the suction dust chamber of a second vacuum cleaner by means of the blower of a first vacuum cleaner. Advantageously, the first vacuum cleaner may be a hand-held vacuum cleaner, and the second vacuum cleaner may be a vacuum cleaner, the suction dust chamber of which has a smaller volume on a regular basis and is therefore more frequently cleaned.

Figur 1:

ein erfindungsgemäßes Staubsaugersystem mit einer Basisstation, einem ersten Staubsauger und einem zweiten Staubsauger,

Figur 2:

das Staubsaugersystem gemäß Figur 1 mit an die Basisstation angeschlossenen ersten Staubsauger,

Figur 3:

das Staubsaugersystem gemäß Figur 1 und 2 mit an die Basisstation angeschlossenen ersten und zweiten Staubsauger,

Figur 4:

einen Querschnitt durch die Basisstation mit einem daran angeschlossenen ersten Staubsauger,

Figur 5:

einen Querschnitt durch die Basisstation mit einem daran angeschlossenen ersten Staubsauger und zweiten Staubsauger.

In the following the invention will be explained in more detail by means of exemplary embodiments. Show it:

FIG. 1:

an inventive vacuum cleaner system with a base station, a first vacuum cleaner and a second vacuum cleaner,

FIG. 2:

the vacuum cleaner system according to FIG. 1 with first vacuum cleaner connected to the base station,

FIG. 3:

the vacuum cleaner system according to FIG. 1 and 2 with first and second vacuum cleaners connected to the base station,

FIG. 4:

a cross section through the base station with a first vacuum cleaner connected thereto,

FIG. 5:

a cross section through the base station with a first vacuum cleaner and second vacuum cleaner connected thereto.

FIG. 1 shows a vacuum cleaner system 19 consisting of a base station 1, a first vacuum cleaner 3 and a second vacuum cleaner 4. The first vacuum cleaner 3, for example, a hand-held vacuum cleaner, while the second vacuum cleaner is, for example, a self-propelled cleaning robot. The base station 1 has a housing, in which at least partial areas of the first and second vacuum cleaners 3, 4 can be received in a form-fitting manner, so that a total of the smallest possible design of the vacuum cleaner system 19 is achieved in the assembled state.

The FIG. 2 shows the first vacuum cleaner 3 connected to the base station 1, wherein the latter is received in a form-fitting manner in partial areas of the housing of the base station 1.

The FIG. 3 shows the base station 1 with the connected first and second vacuum cleaner 3, 4, wherein the second vacuum cleaner 4 is driven automatically under a corresponding portion of the base station 1.

According to the FIGS. 1 to 3 Both the first vacuum cleaner 3 and the second vacuum cleaner 4 suction openings 17 and exhaust openings 18, wherein the suction openings 17 for sucking dust into a suction dust chamber 5, 6 of the vacuum cleaner 3, 4 serve and the outlet openings 18 for blowing out by means of an air filter 16th cleaned air from the vacuum cleaner 3, 4 serve.

FIG. 4 shows a first embodiment of the invention, in which only a first vacuum cleaner 3 is connected to the base station 1. The schematic cross-sectional view shows that the base station 1 has a base dust chamber 2, and a first air inlet 7 and a first air outlet 8, which are fluidically connected to the base dust chamber 2 and provide connections for the first vacuum cleaner 3 available. In the base dust chamber 2, a filter bag is advantageously arranged, in which the reaching into the suction dust chamber 5 dust can be collected. In addition to the first air inlet 7 and the first air outlet 8, the base station 1 additionally has a second air inlet 12 and a second air outlet 13, which serve for connection to a second vacuum cleaner 4. In the flow path between the first air inlet 7 and the second air inlet 12 and between the first air outlet 8 and the second air outlet 13, a valve 14,15 is in each case arranged, which is pivotable from a first position to a second position when a second vacuum cleaner. 4 is connected to the base station 1 and should be cleaned.

The first vacuum cleaner 3 is connected by means of its suction opening 17, the outlet opening 18 and an additional cleaning opening 21 to the flow paths of the base station 1. In addition, the first vacuum cleaner 13 has a suction dust chamber 5, in which an air filter 16, here a permanent filter, is used. The suction dust chamber 5 is connected by means of an air channel 9 with a blower 11 of the first vacuum cleaner 3, which promotes 3 air from the suction port 17 through the air filter 16 to the blower 11 during a conventional suction operation of the first vacuum cleaner. In this case, dust contained in the intake air passes into the air filter 16 and is collected in the suction dust chamber 5. Thus, only dust-purified air flows out to the blower 11 and out the discharge port 18.

The base dust chamber 2 is also connected via a connecting line 22 to the air duct 9. By means of the blower 11, a negative pressure in the base dust chamber 2 can be generated via this. The connecting line 22 also crosses a connecting line 23 connecting the outlet opening 18 with the first air outlet 8 (when the valve 15 is in the position according to FIG FIG. 4 located). However, this is between the connecting line 22 and the connecting line 23 is given no fluid connection.

In the exemplified cleaning mode of the first vacuum cleaner 3, the outlet opening 18 of the first vacuum cleaner 3 is connected to the first air outlet 8 of the base station 1, while the suction opening 17 of the first vacuum cleaner 3 is in fluid communication with the first air inlet 7 of the base station 1. The second air inlet 12 and the second air outlet 13 of the base station 1 are closed by the valves 14, 15, so that no ambient air can reach the base station 1 or the first vacuum cleaner 3 through the second air inlet 12 or second air outlet 13.

The cleaning of the first vacuum cleaner 3 can be started manually by the user or, alternatively, automatically if, for example, a sensor (not shown) arranged on the base station 1 recognizes that a first vacuum cleaner 3 has been connected to the base station 1. Then, the blower 11 is started and arranged in the air duct 9 of the first vacuum cleaner 3 suction valve 20 is closed, so that the air duct 9 is fluidically interrupted and the fan 11 has no direct flow connection to the Saugerstaubraum 5. The air conveyed by the blower 11 flows through the outlet opening 18 of the first vacuum cleaner 3 and passes through a formed in the base station 1 flow channel in the suction dust chamber 5, wherein the air is supplied to the air filter 16 from the inside, so that this contrary to the usual flow direction for a suction operation of the first vacuum cleaner 3 is flowed through. The dust and dirt deposited on the outside of the air filter 16 are entrained by the air flowing in from inside to outside and pass through the suction opening 17 of the first vacuum cleaner 3 to the first air inlet 7 of the base station 1. From there, the dust-laden air subsequently enters the base dust chamber 2, is filtered by a arranged in the base dust chamber 2 filter, such as filter bag, and flows as purified air from the base dust chamber 2 back to the blower 11 of the first vacuum cleaner 3. Thus, the flow loop is closed.

FIG. 5 shows a second embodiment of the invention, in which both a first vacuum cleaner 3 and a second vacuum cleaner 4 connected to the base station 1. The first vacuum cleaner 3 is as in accordance with FIG. 4 explained connected to the base station 1. In addition, the second air inlet 12 and the second air outlet 13 of the base station 1 are now connected to air connections of the second vacuum cleaner 4, in this case the vacuum robot.

The second vacuum cleaner 4 also has a suction dust chamber 6 with an air filter 16 and a fan 11. The suction dust chamber 6 and the blower 11 are connected to each other via an air duct 10.

The base station 1 may have a sensor system (not shown) which detects the presence of the second vacuum cleaner 4 at the second air inlet 12 and the second air outlet 13, for example a touch sensor. A valve control (not shown) may control the valves 14,15 so that the suction channel 10 of the second vacuum cleaner 4 is fluidly connected to the base dust chamber 2 and the blower 11 of the first vacuum cleaner 3. The valve 14 is switched so that there is a flow connection between the second air inlet 12 and the base dust chamber 2. The valve 15 is correspondingly switched so that there is a flow connection between the second air outlet 13 and the blower 11 of the first vacuum cleaner 3. Advantageously, the suction valve 20 is automatically closed within the air duct 9 of the first vacuum cleaner 3.

For cleaning or emptying of the suction dust chamber 6 of the second vacuum cleaner 4, the blower 11 of the first vacuum cleaner 3 is started. By the correspondingly switched valves 14,15 and the suction valve 20 is a closed flow circuit between the blower 11 of the first vacuum cleaner 3, the outlet port 18 of the first vacuum cleaner 3, the second air outlet 13 of the base station 1, the air duct 10 of the second vacuum cleaner 4, the second air inlet 12 of the base station 1, the base dust chamber 2 and finally the blower 11 of the first vacuum cleaner 3 again. In this respect, the blower 11 of the first vacuum cleaner act 3 and the suction dust chamber 6 of the second vacuum cleaner 4 together so that dust contained in the suction dust chamber 6 of the second vacuum cleaner 4 is conveyed by means of the blower 11 of the first vacuum cleaner 3 into the base dust chamber 2 of the base station 1, where the collected dust can be finally disposed of. The base station 1 itself does not require its own blower, since only the blower 11 of the first vacuum cleaner 3 is used both for the cleaning of the suction dust chamber 5 of the first vacuum cleaner 3 and for the cleaning of the suction dust chamber 6 of the second vacuum cleaner 4.

In addition to the embodiments shown, of course, variations are possible, such as another form of switching the valves 14,15, 20 another type of valves 14, 15, 20 or other local positions of the air inlets 7, 12 and air outlets 8, 13 within the base station Provide 1. In addition, the base station 1 can be supplemented by manual or electromechanical valve controls or the like. The embodiments shown are far from limiting.

LIST OF REFERENCE NUMBERS

1

base station

2

Based dust chamber

3

First vacuum cleaner

4

Second vacuum cleaner

5

Vacuum cleaner dust chamber

6

Vacuum cleaner dust chamber

7

First air intake

8th

First air outlet

9

air duct

10

air duct

11

fan

12

Second air intake

13

Second air outlet

14

Valve

15

Valve

16

air filter

17

suction opening

18

outlet

19

Vacuum system

20

suction valve

21

cleaning opening

22

connecting cable

23

connecting line

Claims (10)

Base station (1) for cleaning and / or emptying a suction dust chamber (5) of a first vacuum cleaner (3), which base station (1) has a base dust chamber (2), a first air inlet (7) in fluid communication with the base dust chamber (2) and a with the base dust chamber (2) in flow-connected first air outlet (8), wherein the air inlet (7) and the air outlet (8) are fluidically connected to an air duct (9) of the first vacuum cleaner (3), so that in the suction dust space ( 5) of the first vacuum cleaner (3) by means of a blower (11) of the first vacuum cleaner (3) in the base dust chamber (2) can be conveyed, characterized in that the base station (1) with the base dust chamber (2) fluidly connectable second Air inlet (12) and one with the base dust chamber (2) fluidly connectable second air outlet (13), wherein the second air inlet (12) and the second air outlet (13 ) are fluidically connectable to an air duct (10) of a second vacuum cleaner (4) in a vacuum dust chamber (6) of the second vacuum cleaner (4) contained dust by means of the blower (11) of the first vacuum cleaner (3) in the base dust chamber (2 ) is eligible. Base station (1) according to claim 1, characterized in that the first air inlet (7) and the second air inlet (12) is associated with a valve (14), which is formed, the base dust chamber (2) optionally with the Saugerstaubraum (5) of the first vacuum cleaner (3) or the suction dust chamber (6) of the second vacuum cleaner (4) to connect. Base station (1) according to claim 1 or 2, characterized in that the first air outlet (8) and the second air outlet (13) is associated with a valve (15) which is designed, the blower (11) of the first vacuum cleaner (3) optionally with the Saugerstaubraum (5) of the first vacuum cleaner (3) or the Saugerstaubraum (6) of the second vacuum cleaner (4) to connect. Base station (1) according to one of the preceding claims, characterized in that the valve (14, 15) is set up when the air duct (10) of the second vacuum cleaner (4) is connected to the second air inlet (12) and the second air outlet ( 13) to release a flow connection between the air duct (10) of the second vacuum cleaner (4) and the base dust chamber (2). Base station (1) according to claim 4, characterized in that the valve (14, 15) by mechanical action of a portion of the second vacuum cleaner (4), in particular a Saugkanalendbereiches, is switchable. Base station (1) according to claim 4 or 5, characterized in that the valve (14,15) is connected to an electromechanical valve control, which the valve (14,15) in response to a connection status of the second vacuum cleaner (4) on the second Air inlet (12) and / or the second air outlet (13) controls. Base station (1) according to one of the preceding claims, characterized in that the base station (1) is formed between the first vacuum cleaner (3) and the base station (1) and / or the first vacuum cleaner (3) and the second vacuum cleaner (4 ) to produce a closed flow circuit. Base station (1) according to one of the preceding claims, characterized by an electric charging device which can be connected to an accumulator of the first vacuum cleaner (3) and / or of the second vacuum cleaner (4). Vacuum cleaner system (19) having a base station (1) according to one of the preceding claims, a first vacuum cleaner (3), in particular a hand vacuum cleaner, and a second vacuum cleaner (4), in particular a vacuum cleaner, wherein the air ducts (9, 10) of the vacuum cleaner (9, 10) 3, 4) so to the base dust chamber (2) the base station (1) are connectable, that a closed flow circuit between the first vacuum cleaner (3) and the base station (1) and between the first vacuum cleaner (3) and the second vacuum cleaner (4) is made. Method for cleaning and / or emptying a suction dust chamber (6) of a second vacuum cleaner (4) by means of a vacuum cleaner system (19) according to claim 9, characterized in that the first air inlet (7) and the first air outlet (8) of the base station (1) be connected to the air duct (9) of the first vacuum cleaner (1), and that the second air inlet (12) and the second air outlet (13) of the base station (1) are connected to the air duct (10) of the second vacuum cleaner (4), wherein subsequently in the suction dust chamber (6) of the second vacuum cleaner (4) contained dust by means of the blower (11) of the first vacuum cleaner (3) is conveyed into the base dust chamber (2).

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